These are a few examples that has been bugging me ever since I saw a video of misheard Opeth-lyrics:
Deliverance:
Real: "Floating on mist"
Misheard: "Choking on dicks"
The Drapery Falls
Real: "Deadly patterns made my wreath"
Misheard: "Deadly badgers laid my wreath"
Godhead's Lament:
Real: "What would they care if I would stay, no-one would know, no no"
Misheard: "What would they care if I was gay, no-one would know, ho-mo"
A Fair Judgment:
Real: "Leave it be, it was meant for me"
Misheard: "Leave the pee, it was meant for me"
These are just a few I can think of.